مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 2856
Business Transactions
Business Transactions which are Forbidden - Section 1
وَعَنْهُ قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ عَسْبِ الْفَحْلِ. رَوَاهُ الْبُخَارِيُّ
He said that God’s Messenger forbade [taking hire for] a stallion's covering. Bukhari transmitted it.
Mishkat al-Masabih, 2856صَحِيح (الألباني)